Belt Device Rotational Speed Detection Vibration Isolation
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Solution Overview
Problem
Conventional mechanisms for detecting rotational angular speed or displacement of rollers supporting intermediate or conveying belts in image forming apparatuses suffer from poor precision due to vibrations, leading to detection errors, especially when the time interval of slit detection is short.
Innovation Solution
A belt device with an annular belt supported by at least two rotational bodies, where a rotational member with marks is attached to one end of a rotational shaft and a mark detector is fixed to a positioning supporting member that supports the rotational body at multiple points, ensuring accurate detection by minimizing relative positional fluctuations between the rotational disc and sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rotary encoder is attached to one end of a rotational shaft supported by only one supporting frame, then the detection mechanism is simple, but the roller vibrates causing poor detection precision
Solution Approach 1:
The supporting frame is divided into a first supporting frame and a second supporting frame, with the rotational shaft supported at both ends separately. This segmentation isolates the vibration sources and prevents them from affecting the rotary encoder attachment, thereby improving detection precision while maintaining structural simplicity.
2Productivity
If the time interval of slit detection is shortened to increase measurement frequency, then more real-time data is obtained, but detection errors increase due to vibration
Solution Approach 1:
The rotational shaft is preliminarily supported at both ends by separate supporting frames before the rotary encoder is attached. This preliminary structural arrangement prevents vibration from propagating to the encoder during high-frequency detection operations, enabling accurate measurements even when the time interval between detections is short.
3Reliability
If feedback control is performed based on detected rotational speed to maintain constant belt speed, then out of color registration is prevented, but detection errors propagate to control accuracy
Solution Approach 1:
The system uses feedback control where the rotary encoder detects rotational speed and feeds this information back to adjust the driving source. By supporting the rotational shaft at both ends, the feedback signal becomes more accurate, enabling precise control of the intermediate transfer belt speed to prevent color registration errors.
Data Source
AI summary
One end of a rotational shaft of a supporting rotational body attached with a rotational member is rotatably supported. The rotational member is sandwiched by a supporting frame that rotatably supports supporting rotational bodies spanned with an annular belt and fixing members fixed to the supporting frame. Thus, the one end of the rotational shaft is supported by the supporting frame and the fixing members at, at least two points. A mark detector is fixed to the fixing members, and the fixing members are fixed to the supporting frame at, at least two points. Accordingly, erroneous detection of a rotational angular speed or a rotational angular displacement of a supporting rotational body due to vibration of the supporting rotational body can be suppressed.